The causes of electrical short circuit fires remain one of the leading sources of fire incidents in residential buildings, commercial properties, and industrial facilities in Indonesia. Ironically, most of these incidents are not triggered by major electrical failures, but by the accumulation of everyday electrical misuse or inaccuracies in building electrical system planning.
For owners and facility managers, electrical short circuits are not only a safety hazard but also pose serious risks of operational losses and legal consequences. This article discusses the most common causes of electrical short circuit fires, along with practical and systematic prevention measures that can be implemented to reduce the risk.
Why Electrical Short Circuits Are the No. 1 Cause of Fires in Indonesia?
Electrical short circuits occur when electric current flows through unintended paths, typically due to damaged cable insulation or excessive electrical loads. This condition generates excessive heat (overheating) and electrical arcing, which can quickly ignite nearby combustible materials.
The challenge is that short circuits often develop without visible warning signs. Unlike fires caused by gas leaks or open flames, electrical faults can progress behind walls, ceilings, or within enclosed panels. By the time flames become visible, the fire has usually grown significantly and is difficult to control.
Another factor that worsens the situation is the mismatch between actual electrical demand and the original design capacity of the building’s electrical installation. Many buildings—particularly commercial properties and operational facilities—add electrical equipment over time without reassessing the electrical system design. As a result, the system operates beyond its safe capacity.
In addition, compliance with electrical installation standards is often not supported by long-term supervision and maintenance. Cables age, insulation becomes brittle, connections loosen, and distribution panels are rarely subjected to comprehensive audits.
From a facility management perspective, electrical short circuit fires are not merely technical failures, but a reflection of the absence of a risk-based approach in the design and management of fire protection systems.
5 Common Habits That Trigger Electrical Short Circuits
1. Overloaded Power Outlets
The use of stacked power strips or extension cords is one of the most common practices in office buildings, commercial facilities, and operational areas. A single outlet is often forced to supply multiple high-wattage appliances at once—such as water dispensers, microwaves, coffee machines, or servers—without considering the maximum allowable current capacity.
When the electrical load exceeds the rated capacity, cables and sockets experience a significant temperature rise. This overheating can melt cable insulation, cause arcing at connection points, and ultimately lead to an electrical short circuit.
2. Poor-Quality Cables and Plugs
Low-quality cables and plugs are frequently used due to cost considerations and ease of procurement. However, thin conductor materials, heat-intolerant insulation, and loose connectors are highly susceptible to damage over time.
Loose plugs in outlets can create electrical arcing or micro-sparks that generate extreme heat at the contact point. Over time, this condition is sufficient to ignite a fire—especially when located near combustible materials.
3. Improper Cable Installation
Cable installations that do not comply with technical standards represent a latent fire risk. Cables that are sharply bent, compressed by building structures, or rubbed against sharp surfaces will suffer insulation damage as time progresses.
This issue is commonly found in buildings that undergo phased renovations or functional changes without redesigning the electrical system. When damaged cables come into direct contact with conductive materials or metal structures, an electrical short circuit becomes almost unavoidable.
4. Coiling Cables While in Use
Coiling electrical cables while equipment is operating may seem harmless, but it is extremely dangerous. Coiled cables restrict the natural dissipation of heat generated by electrical current. As a result, heat builds up within the coil and dramatically increases the cable temperature.
Under certain conditions, this temperature rise is sufficient to damage or even melt the cable insulation—especially in low-quality extension cords. This risk is commonly found in kitchens, service areas, or building workshops.
5. Electrical Equipment Operating Continuously
Electrical equipment that operates non-stop—such as air-conditioning units, servers, refrigeration systems, or production machinery—undergoes prolonged heat cycles. Without adequate protection systems, internal components may degrade, electrical connections can loosen, and insulation quality may deteriorate over time.
The risk becomes significantly higher when equipment is not equipped with automatic cut-off systems for overcurrent or overheating. In many fire incidents, the ignition source can be traced back to equipment left operating unattended for extended periods.
Practical Prevention Measures You Can Implement Now
1. Conduct an Electrical Load Audit in Critical Areas
The most fundamental step is to ensure that actual electrical loads match the original design capacity of the installation.
Areas such as pantries, server rooms, production areas, and shared workspaces often experience equipment additions without corresponding electrical system upgrades.
This audit helps identify overloaded outlets, circuits operating near their maximum capacity, and the need for power redistribution.
2. Standardize the Use of Cables, Plugs, and Power Outlets
Ensure that all cables, plugs, and electrical terminals comply with national standards (SNI) or relevant international standards. Non-standard components are often not heat-resistant and are not designed for long-term use, significantly increasing the risk of electrical short circuit fires.
3. Organize and Protect Electrical Cable Routing
Proper cable routing not only improves safety but also facilitates routine inspection and maintenance. Use conduits, cable trays, or mechanical protection to prevent damage caused by pressure, abrasion, or operational activities.
4. Implement Safe Operating Procedures for Electrical Use
Without clear Standard Operating Procedures (SOPs), the risk of electrical short circuits will persist even if the electrical installation already meets technical standards. Apply simple yet critical rules, such as prohibiting coiled cables while in use, requiring plugs to be unplugged after use, and limiting the use of stacked power strips or extension cords.
5. Schedule Routine Inspections and Preventive Maintenance
Regular inspections enable early detection of issues such as aging or brittle cables, loose plugs, or equipment showing signs of overheating.
Many fire incidents occur not because of sudden failures, but due to minor problems left unaddressed for too long. Preventive maintenance helps identify potential electrical short circuit hazards before they escalate into serious incidents.
6. Complement with an Appropriate Fire Protection System
The practical measures above will be far more effective when supported by a fire protection system designed to match the building’s specific risk profile.
Properly selected fire extinguishers for electrical fires, early detection systems, and risk-based fire protection planning serve as the final layer of defense when electrical short circuits cannot be completely avoided.
Types of Fire Extinguishers Suitable for Electrical Fires
Fires caused by electrical short circuits fall under C fire class (based on NFPA classification), which involve energized electrical equipment. Selecting the correct type of fire extinguisher is critical, as using an inappropriate extinguishing agent can significantly increase the risk to occupants and responders.
CO₂ fire extinguishers are among the most commonly used and highly recommended options for electrical fires. CO₂ works by displacing oxygen around the fire, interrupting the combustion process without leaving any residue, making it safe for sensitive electrical equipment.
Dry chemical powder extinguishers (typically ABC type) are also suitable for electrical fires because the powder agent is non-conductive. For facilities with higher risk profiles, clean agent fire extinguishers may be preferred, as they effectively suppress fires without residue, are safe for electrical equipment, and minimize operational disruption after the incident.
Water-based fire extinguishers must never be used on electrical fires while the equipment is still energized. Water is conductive and can cause fatal electric shock, as well as increase the likelihood of fire spread.
Minimize Risk with Proper Fire Protection System Design
Understanding the causes of electrical short circuit fires alone is not sufficient without being followed by proper fire protection system planning. Without a risk-based design approach, a minor short circuit in electrical panels, production equipment, or aging installations can escalate into a major fire that endangers personnel safety and disrupts business operations.
Through its Fire Protection System Design services, Lumeshield helps you develop fire protection solutions aligned with electrical fire risks—from selecting the appropriate type of fire extinguisher, strategic placement of early fire detection systems, to integration with fire alarm systems and emergency power shut-off. This approach ensures that potential causes of electrical short circuit fires are controlled at the planning stage, rather than being addressed only after an incident has occurred.
Want to ensure your facility is truly prepared to manage electrical fire risks? Contact us to start a consultation for a targeted, standards-compliant fire protection system design.